"Vet" here (30 days away from Primed Split Chamber). The only two things you suggested that don't suck for a vet are cosmetics (assuming they are uniquely acquirable through the login system) and maybe a non-realizable Tennogen voucher. I couldn't care less about the rest.

I don't need vaulted relics, because I own the shit they have in them already. I don't need a plat discount, because essentially everything I get in fissures can be turned into plat via trading, because of the first point. Rivens? I already have 40 useless ones, no thank you. Boosters aren't really needed. I swim in most ressources.

I'm not trying to brag or to be an ass, but if you'd be at a "veteran" point yourself you'd know we pretty much only wait for new content to release, clear it and then basically wait for the next one to get heavily invested again. I have no problem with the rewards changing or whatever to make it less of a grind for newer players, but your suggestions aren't really anything I'd look forward to and quite frankly I wouldn't know what would be better than what we have now.